Calculate the standard deviation of the grouped data in the problem. Create an extended table using five additional columns.ClassFrequency, F0 - 9 sec1110 - 19 sec1220 - 29 sec1930 - 39 sec2040 - 49 sec2150 - 59 sec17
What will be an ideal response?
| Class | Freq., F | Midpt., M | F*M | (M -  ) | (M -  )2 | F(M -  )2 |
| 0 - 9 sec | 11 | 4.5 | 49.5 | -27.9 | 778.41 | 8562.51 |
| 10 - 19 sec | 12 | 14.5 | 174 | -17.9 | 320.41 | 3844.92 |
| 20 - 29 sec | 19 | 24.5 | 465.5 | -7.9 | 62.41 | 1185.79 |
| 30 - 39 sec | 20 | 34.5 | 690 | 2.1 | 4.41 | 88.2 |
| 40 - 49 sec | 21 | 44.5 | 934.5 | 12.1 | 146.41 | 3074.61 |
| 50 - 59 sec | 17 | 54.5 | 926.5 | 22.1 | 488.41 | 8302.97 |
| ? | n = 100 | ? | Sum = 3240 | ? | ? | Sum = 25,059 |
= 
= 32.4 sec
? 15.91 sec.
Mathematics
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